The DOLD GB9024 is a reliable insulation monitor designed for ungrounded AC systems (IT systems) with a nominal voltage of up to 400V. It provides continuous monitoring of the insulation resistance between the system conductors and earth. By detecting insulation faults at an early stage, the GB9024 helps to prevent unexpected system downtimes, reduce the risk of fire, and enhance operational safety. This device features an adjustable response value, allowing for precise customization to specific application requirements. Its compact design and easy DIN rail mounting make it a versatile solution for various industrial, medical, and mobile power generation applications where supply continuity is critical.